The Classics section has been divided in two as there is a distinction about when a book is written among other criteria that classifies it as a classic.  Generally, a book has to be written before World War Two to be considered as a classic and endure engagement across generations.  There are other criteria, which have been hotly debated by critics and renowned authors.    Below are three articles which provide a good introduction to the criteria used.

The Definition of a Classic in Literature

Italo Calvino’s 14 Criteria for What Makes a Classic

What makes a classic? – this article focuses on children’s classic literature